hymkor/struct2flag から fork した goark/struct2pflag をリリースした

package main

import (
	"fmt"
	"strings"

	"github.com/goark/struct2pflag"
	"github.com/spf13/pflag"
)

type Flags struct {
	N    bool   `pflag:"no-newline,n,omit trailing newline"`
	Sep  string `pflag:"sep,s,separator"`
	Strs []string
}

func NewFlags() *Flags {
	return &Flags{N: false, Sep: " ", Strs: []string{}}
}

func Echo(f *Flags) {
	fmt.Print(strings.Join(f.Strs, f.Sep))
	if !f.N {
		fmt.Println()
	}
}

func main() {
	f := NewFlags()
	struct2pflag.BindDefault(f)
	pflag.Parse()
	f.Strs = pflag.Args()

	Echo(f)
}

$ go run echo4a.go -h
Usage of /tmp/go-build2259633867/b001/exe/echo4a:
  -n, --no-newline   omit trailing newline
  -s, --sep string   separator (default " ")

$ go run echo4a.go --sep / May the Force be with you
May/the/Force/be/with/you

$ go run echo4a.go -s / May the Force be with you
May/the/Force/be/with/you

type Flags struct {
	N    bool   `flag:"n,omit trailing newline"`
	Sep  string `flag:"s,separator"`
	Strs []string
}

$ go run echo4b.go -h
Usage of /tmp/go-build1365887832/b001/exe/echo4b:
      --n          omit trailing newline
      --s string   separator (default " ")